HD74LSP Specifications: Gate Type: NAND ; Supply Voltage: 5V ; Logic Family: TTL ; Inputs: 8 Details, datasheet, quote on part number: HD74LSP . The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas. Technology Corporation on April 1st HD74LSP from Renesas Electronics. Find the PDF Datasheet, Specifications and Distributor Information.

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Joystick Schematic 52 R14 serves to load the capacitively-coupled output characteristic of most portable cassette recorders, and R18 limits the current of the incoming signal to prevent damage to the SALT chip if an excessively large peak-to-peak voltage is fed into the cassette input. CB1 is the cartridge interrupt input. As the count falls through zero, an interrupt is generated if enabledand the count is automatically reloaded. The is connected ider part of f 4 is used to to Pin 2 of register A is the input for data from the cassette.

When the incoming signal goes high, the transistor becomes saturated and connects its end of the cassette relay to ground, causing the relay to energize.

HD74LSP (RENESAS) PDF技术资料下载 HD74LSP 供应信息 IC Datasheet 数据表 (8/8 页)

Horizontal Sync Pulse Width adjustment Connection: The relationship between the data in the task register and the generated address is as follows: These direction control registers are set up by the reset routine and normally will not be changed. Please contact Renesas Technology Corp. The output of the DAC is then buffered and attenuated to provide approximately 3.


PAL input and transforms it to Descr ipt ion RS Part No. The collector exits the SALT chip datashheet pin 9 and hd74l3s74p connected to one end of the cassette relay.

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This would hd4ls374p accomplished by connecting unused device inputs to the correct high or low level. Joystick Schematic 5. The printer width is columns.

This gives the effect of a two-dimensional control. Pins of data register A are used for the 6-bit digital to analog converter. PIA IC5 is a select device.

Du Pont de Nemours and Company. This tells the computer that the printer is ready all of the time.


The switch box is connected to the customer’s TV through the ohm twin-lead output. In order to address a 64K location in each chip, 16 address lines are required. If less than that, they are considered to be a mark.

SALT Block Diagram IC8 The SALT chip senses, hd74ls3374p pin 2, the amount of current drawn from the supply hd74la374p R If excessive current is drawn, as in the case of a short or component failure, the SALT will “fold back” the voltage output of the supply by reducing the base drive current, thus protecting the supply. SND – This signal is connected directly to the sound input of the DAC chip and allows cartridge-generated sound signals to be fed through the TV sound system.

It is designed to provide the same reliable operation as its predecessor, but it incorporates the latest in electronic technology. These determine which of the joystick inputs is to hf74ls374p compared against the DAC, as well as which sound source is coupled to the sound output pin according to the table on the next page.


PIA Block Diagram 5. Search the history of over billion web pages on the Internet. The final function of the DAC chip is to provide the output signal for recording of cassette data. Loosen and remove the six four screws SI and two longer screws S2 mounting screws which attach the base to the top cover. Additional peripheral devices, such as an external disk drive, may hd74s374p added to the Color Computer 3 for additional memory storage hr74ls374p retrieval.

One block type byte: It simply consists of a push-button switch for the fire button and the dual potentiometers connected by a mechanical assembly.

HD74LS3 datasheet & applicatoin notes – Datasheet Archive

MMU Block Diagram 37 Additional information may be obtained from the 68B09E data sheet. When power is applied to the CPU, it immediately attempts to fetch a vector and begin executing instructions. A list of all the printer variables is given in Table 1.

In this step it is wise to check the obvious. This is a bit interval timer. Dl and D2 form a full-wave, center-tapped rectifier with a positive output which is filtered by electrolytic capacitor C